I have been ignoring this thread as long as possible, but I now feel the need to interject. I have raised dairy goats for almost 14 years and:
That's A LOT of replacer for such young babies. Overfeeding (or feeding it too fast) is one of the leading causes of runny poo, and yes, it will cause abdominal pain and cramping.
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Also, babies poo IS yellow, that is nothing to worry about.
Have a fecal done before you start putting medication where it may or may not belong, remember all wormers, etc are toxic. if they weren't, they wouldn't kill the parasites.
Most vets don't charge more than an office visit to do a fecal, and they will be able to tell you what parasites you have or don't have, and the best course of action, without the need to randomly medicate/worm/etc.
It is irresponisble to throw toxic substances down the throat of babies without proper cause. It really angers me when people start medicating for anything and everything without taking the time to evaluate the harm they could be doing, call your vet and get a fecal, you owe it to your animals to do what is right by them.
I appologize if this post offends, but more and more I see newbies encouraged to medicate for this, medicate for that, wormer here, antibiotic there-instead of finding out the root cause and treating for THAT particular affliction.
Would you give your child penicillin, sore throat drops, baby aspirin and a dose of dog wormer if they were sick? No, you would take them to a doctor and find out what is ACTUALLY wrong with them, and treat it.